Question

Which of the following properties are shared by the alpha-helicies and beta-sheet structures in proteins?

a. they form rod-like shapes
b. they are always hydrophobic
c. they are always found at the NH-end of the protein
d. they are stabilized by hydrogen bonds between peptide bonds
e. they are stabilized by di-sulfide bonds

Answer 1

The alpha-helix and beta-sheet structures in proteins share properties such as forming rod-like shapes and being stabilized by hydrogen bonds between peptide bonds. However, they do not always have to be hydrophobic or found exclusively at the NH-end of the protein.

Step-by-step explanation:

The alpha-helix and beta-sheet structures in proteins share several properties:

1. They both form rod-like shapes. The alpha-helix is a spiral shape, while the beta-sheet consists of alternating rows of amino acids that align side by side.
2. They are both stabilized by hydrogen bonds between peptide bonds. In the alpha-helix, hydrogen bonds form between the carbonyl group of one amino acid and the amino group of another amino acid in the same chain. In the beta-sheet, hydrogen bonds form between the carbonyl groups and amino groups of amino acids in different chains.
3. They do not always have to be hydrophobic or found exclusively at the NH-end of the protein. The hydrophobicity and location of these structures can vary depending on the specific protein.